Adjustable table base



FIG. 1 is a side elevational view of an adjustable table base, in its fully elevated position, showing my new design;

FIG. 2 is an end elevational view, the opposite end being identical thereto;

FIG. 3 is a perspective view in its partially lowered position, on a reduced scale; and

FIG. 4 is a perspective view in its fully lowered position on a reduced scale thereof. 

The ornamental design for adjustable table base, as shown and described. 